Boiler-furnace.



PATEN-TED JULY 11, 1905.

J. SIEBEL BOILER FURNACE.

APPLICATION FILED APR. 21. 1905.

W M IIVVE/VTUH.

WITNESSES. {@M@h%% Patented July 11, 1905.

PATENT OFFICE.

JOHN SIEBEL, OF LOUISVILLE, KENTUCKY.

BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 794,556, dated July 11,1905.

Application filed April 21, 1905. Serial No. 256,788.

1'0 aZZ w/wnt it may concern:

Be it known that 1. JOHN SIEBEL, a citizen of the United States, and aresident of Louisville, in the county of Jefferson and State ofKentucky, have invented a new and useful Improvement in Boiler-Furnaces,of which the following is a specification.

My invention relates to the construction of the grates ofboiler-furnaces and to'the construction and arrangement of thebridgewalls.

The objects of my device are to create a better draft; to separate thehot gases from the cooler unburned gases and solids after their passageout of the furnace proper, so that they can then be burned; to produce amore complete combustion of the fuel, and to afford a means for morereadily stoking and cleaning the grate. To attain these objects, I makeuse of the mechanism shown in the accompanying drawings, in which Figure1 is an elevation of the contrivance, the walls being in section. Fig. 2is an elevation of the front bridge-wall F. Fig. 3 is an elevation ofthe rear bridge-wall G.

The same letters refer to the same parts in all the figures.

A is the boiler.

L is a horizontal grate.

H H represent a supplemental grate sloping upward to the door I in thefurnace-front and spaced from the horizontal grate which extendsunderneath it.

F is a bridge-wall having a central transverse recess D, preferablyabout three inches wide and about a foot deep. Behind this wall is thebridge wall G, which is somewhat higher than the first wall and isprovided with a passage-way B on the same horizontal plane as recess Dand directly behind it. This passage-way is preferably circular and witha diameter of about a footthat is, as great as the depth of the recess.The rear bridge-wall G is hollowed out at its top directly under theboiler, so as to leave an opening G for the passage of heated air andproducts of combustion, as in ordinary furnaces, this opening beingpreferably crescent-shaped. Between the two bridge-walls to somedistance below the recess rises the wall P, the three walls forming thechamber Q.

M is the combustion-chamber behind the rear wall, from which the heatedair, &c., are conducted into the boiler-tubes.

R is the ash-pit, and K the door leading to it.

J is the door leading into the furnace underneath the inclined grate-bedH H.

Having now described my contrivance, lexplain its operation.

The fresh or green coal being deposited on the inclined front of thegrate, the flame is naturally directed rearward rather than upward morethan with ordinary grates, thus improving the'draft. When the flamesreach the first bridge-wall, this draft is increased by reason of therecessD in line with the passage-way B, and the force of the fire, aidedby gravity, precipitates much of the unburned substance into the chamberQ. There it is gradually consumed by the fierce flames passing throughthe recess. So much of the unburned substances as remain is carried onby the current through the passage-way B in the second wall and dropsbehind the second wall G into the combustion-chamber M. There it isgradually taken up and consumed by the heat of the flames passing overit. The main part of the flame passes over the wall G through thecrescent -shaped opening C. It should be noted that the chief depositsof smoke. soot, &c., are made directly after a fresh firing, and untilthe next firing the flames have opportunity to consume these deposits. 1find that very good effects can be obtained from my furnace even if thefirst bridge-wall be omitted. By having the front part of the grate-bedinclined and leaving a space. between its lower end and the maingrate-bed I not only improve the draft, but by allowing the hot coals todrop through. between its bars onto the extension of the main bed Iprovide a very hot fire under the incline, thus aiding in theconsumption of the fresh coal. When it is thoroughly ignited, it may bepushed back on the main grate, and through the space between the twopartsof the bed it is convenient to stir the coals on the main floor andpull out the clinkers. On account of the intense heat applied to thefront portion of the grate-bed I prefer to make its bars of hollow pipe,through which water can be kept flowing.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a boiler-furnace, the combination of a boiler, a horizontal grate,a supplemental rearwardly-inclined grate above, and spaced from, thefront portion of said horizontal grate, a bridge-walLprovided at its topwith a central transverse recess, a second bridgewall behind and spacedfrom said first-mentioned bridge-wall, said second wall having apassage-way therethrough, and extending upward around the boiler andhaving a recess thereunder, and a lower wall between the twobridge-walls, said walls forming a chamber, substantially as described.

2. In a boiler-furnace, the combination of a boiler, a horizontal grate,a supplemental rearwardly-inclined grate above, and spaced from, thefront portion of said horizontal grate, a bridge-wall provided at itstop with a central transverse recess, a second bridgewall behind, andspaced from said first-mentioned bridge-wall, said second wall having apassage-way therethrough and extending upward around the boiler andhaving a recess thereunder, substantially as described.

3. In a boiler-furnace, the combination of a boiler, a bridge-wallprovided at its top with a central transverse recess, a secondbridge-wall behind and spaced from, said firstmentioned bridge-wall,said second wall'having a passage-way therethrough and extending upwardaround the boiler and having a recess thereunder, substantially asdescribed.

In testimony of which I have signed this specification before twowitnesses.

JOHN SIEBEL.

Witnesses:

A. LINCOLN DEMBITZ, HENRY W. BUSOHEMEYER.

